WATCH: Spacewalk For Repairs At International Space Station

In this Saturday, Dec. 21, 2013 photo provided by NASA and tweeted Sunday, Dec. 22, by NASA astronaut Michael Hopkins, Hopkins work to repair an external cooling line on the International Space Station on a spacewal... In this Saturday, Dec. 21, 2013 photo provided by NASA and tweeted Sunday, Dec. 22, by NASA astronaut Michael Hopkins, Hopkins work to repair an external cooling line on the International Space Station on a spacewalk 260 miles above Earth. The external cooling line — one of two — shut down Dec. 11. The six-man crew had to turn off all nonessential equipment, including experiments. (AP Photo/NASA) MORE LESS
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Two U.S. astronauts are performing a spacewalk Tuesday at the International Space Station to repair the station’s cooling system.

They’re venturing out for the second time in four days. Astronauts last took a spacewalk on Christmas Even in 1999.

Watch the NBC livefeed below.

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